On 10/29/2012 05:20 PM, Dmitry Osipenko wrote:

Fixed channel "lock up" after free.

Lock scenario: Channel 1 was allocated and prepared as slave_sg, used and freed.
Now preparation of cyclic dma on channel 1 will fail with err "DMA configuration
conflict" because tdc->isr_handler still selected to handle_once_dma_done.

This happens because tegra_dma_abort_all() won't be called on channel freeing
if pending list is empty or channel not busy. We need to clear isr_handler
on channel freeing to avoid locking. Also I added small optimization to prepare
functions, so current channel type checked before making allocations.

Reviewed-by: Stephen Warren <redacted>

I believe this looks OK. However, I would like Laxman to also ack/review
this since he wrote the driver.